/**
  * Author: Mei
  * Date: 2020-11-21 16:01
  * Description: 
  *
  */
#include <iostream>
#include <cstring>
using namespace std;


int main() {
    int a = 10;
    int b = 10;
    const int &c = a + b;
    //d为右值引用
    int &&d = a + b;
    d += 10;
    cout << d << endl;

    return 0;
}